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authorSebastian Huber <sebastian.huber@embedded-brains.de>2018-05-23 14:17:25 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2018-06-15 13:02:44 +0200
commit65f868cac6f7fd5c3ad02046574c19f8f4673255 (patch)
tree15103fb87ed2e7161c17006e2c077f35e3506a95 /cpukit/score/cpu/no_cpu
parentAdd RTEMS_SYSINIT_CPU_COUNTER (diff)
downloadrtems-65f868cac6f7fd5c3ad02046574c19f8f4673255.tar.bz2
Add _CPU_Counter_frequency()
Add rtems_counter_frequency() API function. Use it to initialize the counter value converter via the new system initialization step (RTEMS_SYSINIT_CPU_COUNTER). This decouples the counter implementation and the counter converter. It avoids an unnecessary pull in of the 64-bit integer division from libgcc. Update #3456.
Diffstat (limited to 'cpukit/score/cpu/no_cpu')
-rw-r--r--cpukit/score/cpu/no_cpu/Makefile.am1
-rw-r--r--cpukit/score/cpu/no_cpu/cpucounterfrequency.c20
-rw-r--r--cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h7
3 files changed, 28 insertions, 0 deletions
diff --git a/cpukit/score/cpu/no_cpu/Makefile.am b/cpukit/score/cpu/no_cpu/Makefile.am
index 556d3dea34..0d89f5af2b 100644
--- a/cpukit/score/cpu/no_cpu/Makefile.am
+++ b/cpukit/score/cpu/no_cpu/Makefile.am
@@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
noinst_LIBRARIES = libscorecpu.a
libscorecpu_a_SOURCES = cpu.c cpu_asm.c
+libscorecpu_a_SOURCES += cpucounterfrequency.c
libscorecpu_a_SOURCES += cpucounterread.c
libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/cpukit/score/cpu/no_cpu/cpucounterfrequency.c b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c
new file mode 100644
index 0000000000..bbb8c127fe
--- /dev/null
+++ b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2018 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems/score/cpu.h>
+
+uint32_t _CPU_Counter_frequency( void )
+{
+ return 1000000000;
+}
diff --git a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
index 5902b4ef36..45edbaa3cf 100644
--- a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
+++ b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
@@ -1329,6 +1329,13 @@ static inline uint32_t CPU_swap_u32(
typedef uint32_t CPU_Counter_ticks;
/**
+ * @brief Returns the current CPU counter frequency in Hz.
+ *
+ * @return The current CPU counter frequency in Hz.
+ */
+uint32_t _CPU_Counter_frequency( void );
+
+/**
* @brief Returns the current CPU counter value.
*
* A CPU counter is some free-running counter. It ticks usually with a